 Literature
 Specifications
 Functions
 Optional Functions
 Software
 Acc.
Model: Yokogawa WT1800E Power Analyzer 
Input 
WT1801E 
WT1802E 
WT1803E 
WT1804E 
WT1805E 
WT1806E 
Number of elements 
1 element 
2 elements 
3 elements 
4 elements 
5 elements 
6 elements 
Available with 5A or 50A input element 


Basic power accuracy: 
: ±(0.05% of reading + 0.05% of range) 
Measurement bandwidth: 
DC, 0.1 Hz to 1 MHz 
Low Power Factor Error: 
Power factor influence when cosø = 0
0.07% of reading value of apparent power 
Current Range: 
Direct Input: 1/2/5/10/20/50 A*2
10/20/50/100/200/500 mA, 1/2/5 A (50A & 5A can be installed together) 
Current Range: 
External Input: 50/100/200/500 mV, 1/2/5/10 V 
Voltage Range: 
1.5/3/6/10/15/30/60/100/150/300/600/1000 V 
Inputs 
Crest Factor: Maximum 300 

Voltage 
(for crest factor 3) 
1.5 V, 3 V, 6 V, 10 V, 15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V, 1000 V

(for crest factor 6/6A) 
0.75 V, 1.5 V, 3 V, 5 V, 7.5 V, 15 V, 30 V, 50 V, 75 V, 150 V, 300 V, 500 V 
Direct Input: 
Current 
50 A input element 

(for crest factor 3) 
1A, 2 A, 5 A, 10 A, 20 A, 50A 
(for crest factor 6/6A) 
500 mA, 1 A, 2.5 A, 5 A, 10 A, 25 A 
5 A input element 

(for crest factor 3) 
10 mA, 20 mA, 50 mA, 100 mA, 200 mA, 500 mA, 1 A, 2 A, 5A 
(for crest factor 6/6A) 
5 mA,10 mA, 25 mA, 50 mA, 100 mA, 250 mA, 500 mA, 1 A, 2.5 A 
External Input: 
Current Sensor 
(for crest factor 3) 
50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, 10 V 
(for crest factor 6/6A) 
25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V, 5 V 
inputs 

Universal analog inputs: 
Two analog inputs (/AUX option) 
Rotation speed input: 
Aphase, Bphase, Zphase input (/MTR option) 
A/D output 

DA output channels: 
20 ch (/DA option) 
A/D converter 
16bit resolution 
Data Memory 

Data memory: 
Direct save to USB device up to 1 GB 
Data Update 

Rate: 
9 intervals from 50 ms to
20 s but can also follow fluctuating input frequencies changing the data update rate automatically 
Measurement Parameters 
Main: 
Voltage, current, active power, reactive power, apparent power, power factor, phase angle,
frequency, peak voltage, peak current,crest factor, integration (Wh, Ah, varh, Vah) 

MAX hold
Voltage RMS/MEAN simultaneous measurement
Average active power (user defined function)
Active power integration (WP) (Wh)
Apparent power integration (WS) (VAh)
Reactive power integration (WQ) (varh) 
Motor evaluation 
Torque, A / B / Z phase signal inputs (/MTR), 6 inputs, & motor evaluation (opt.) 
Delta Calculation 
Voltage (V) 
difference, 3P3W ⇒ 3V3A, DELTA ⇒ STAR, STAR ⇒ DELTA 
Current (A) 
difference, 3P3W ⇒ 3V3A, DELTA ⇒ STAR, STAR ⇒ DELTA 
Power (W) 
DELTA ⇒ STAR 
Harmonic Measurement in Normal Measurement 
Format 
PLL synchronization method(without external clock sampling function) 
Frequency range 
With Data update interval set to other than Auto, or with the Data update
interval set to Auto and FFT data length is set to 8192, Fundamental frequency of
the PLL source is in the range of 0.5 Hz to 2.6 kHz.
When the Data update interval is set to Auto and FFT data length is set to 1024,
Fundamental frequency of the PLL source is in the range of 0.1 Hz to 2.6 kHz. 
Window 
Rectangular 
FFT data length 
1024 data update rate is 50 ms, 100 ms, or 200 ms
8192 data update rate is 500 m, 1 s, 2 s, 5 s, 10 s, or 20 s 
Display— 
Display: 
8.4lnch XGA TFT color LCD 
Waveform Display 
Numerical: 
Select 4, 8, 16, Matrix, ALL, Harmonic
Single List, Harmonic Dual List,
and Custom 
Sampling rate: 
Approximately 2 MS/s. 
Time axis: 
Range from 0.05 ms to 2 s/div. However, 1/10 or less of the data update
interval when Data update interval is set to other than Auto.
Range from 0.05 ms to 5 ms/div when the Data update interval is set to
Auto. 
Waveform: 
Peaktopeak compression data.
If the time axis is set so that there will be insufficient sampling data, the
part lacking data is filled with the preceding sampling data. 
Builtin Printer (/B5 Option) 
Print type: 
Thermal line/dot matrix – 8dot/mm, width: 80 mm [Effective print width: 72 mm] 
Environment 
Power supply: 
100 to 120VAC/220 to 240VAC (automatic switching) — 50/60Hz 
Power consumption: 
Max 150 VA (when using printer) 
Operating Temperature: 
5 to 40°C, 20 to 85% RH 
Dimensions: 
Approximately 426 (W) x 177 (H) x 459 (D) mm (including 253710 printer cover; does not include knobs and projections) 
Weight: 
Approx. 15 kg (main unit with four power modules installed) 
Simple and easy to use, Exceptional crisp display
Make simultaneous measurements on up to 6 inputs at 2 MS/s (16 bits). The high resolution 8.4 inch XGA display of the WT1800E allows split screen viewing of up to 6 waveforms and can display up to 12 pages of diverse measurement parameters making it ideal for efficiency tests of inverter driven motors, renewable energy technologies and traction applications like pumps, fans and hybrid/electric vehicles. The unit can also display measurements in vector format or trending in time.
 Range configuration.
Track signal changes faster by eliminating unnecessary range changes. The WT1800E’s range configuration function allows users to select input ranges based on their specific use cases so that optimal range settings are achieved quicker. This reduces the time during repetitive production tests, such as setting to OFF, 100 V, OFF and so on, which is performed frequently on the production line.
 Measure accurately at a wide range of voltage, current and frequency conditions. The basic power accuracy of the WT1800E is guaranteed between 1% to 110% of the selected voltage and current range. This equates to voltages from 15 mV to 1100 V rms and currents from 0.1 mA to 5.5 A rms (for a 5 A input element) and 10 mA to 55 A rms (for a 50 A input element). The unit is also accurate during large phase shifts and high frequencies thanks to the minimized influence of the low power factor error (±0.07% of apparent power).
A Wide Variety of Display Formats
Ranging from Numerical, Dual harmonic measurement, Simultaneous two vector display, Trend, combination display of Information and customizable screen display
 Dual Harmonic (optional)
 Dual Vector (Simultaneous two vector displays)
 Waveform (Support for 6 split screen displays)
 Trend (Capture efficiency changes visually)
 Setting information (Combination display of Information and Numerical screens)
 Custom (Customize display screen)
Wide range of standard functions
— The WT1800E is equipped with an array of sophisticated functions for precise and simultaneous measurements of the power conversion efficiency of instrument, as well as, equipment evaluation efficiency by making simultaneous power evaluations and tests easier and faster.
New Functions
The advanced new functions provide greater measurement versatility by making power analysis measurements more efficient
 Twochannel external signal input is available for power and analog signal measurement (option available in combination with the motor evaluation function) Power measurements can be performed together with physical quantity data such as solar irradiance or wind power in wind generation
 Electrical angle measurement. Motor evaluation function: Aphase, Bphase, and Zphase inputs (option available in combination with external signal input). Pulse or analog signals can be input for rotation speed and torque signal measurements. The motor evaluation function of the WT1800E makes it possible to detect the rotation direction and measure the electrical angle, which is not possible with previous models
 Userdefined event function (Trigger)
For the first time in the highprecision power analyzer industry, an event trigger function is available to meet the requirement to capture only a particular event. For example, a trigger can be set for measured values that fall out of the power value range from 99 W to 101 W and only data that meets the trigger condition can be stored, printed, or saved to a USB memory device
Measurements
High precision, widerange, fastsampling and simultaneous harmonic measurement
 Guaranteed accuracy across a wide range: Measure accurately at a wide range of voltage, current and
frequency conditions. The basic power accuracy of the
WT1800E is guaranteed between 1% to 110% of the selected
voltage and current range. This equates to voltages from 15 mV
to 1100 V rms and currents from 0.1 mA to 5.5 A rms (for a 5 A
input element) and 10 mA to 55 A rms (for a 50 A input element).
The unit is also accurate during large phase shifts and high
frequencies thanks to the minimized influence of the low power
factor error (±0.07% of apparent power).
 Harmonic distortion factor measurement: Voltage fluctuations and harmonics flow into the power system due
to reverse power flow. A harmonic measurement function enables
measurement of harmonic components to compute and display total
harmonic distortion factor (THD)
 Power integration and autoranging: Measure energy bought and sold in grid connections or
charged and discharged in batteries. The WT1800E’s Power
integration function integrates instantaneous values for both
positive and negative readings. It also measures total energy
(Wh) and current (Ah) when load conditions vary widely like in
devices transitioning from standby to operation mode.
Should an input signal start to fall out of the expected range,
this function can automatically adjust the range while
continuing to integrate the measured values.
 The setting ranges of voltage and current are usually displayed with voltage and current signal levels that are input to the power analyzer
 High speed data capture: The High Speed data capturing function can measure
SigmaUrms, SigmaIrms and SigmaP from DC signal and
three phase devices every 5 ms when External
Synchronization is OFF or, 1 ms to 100 ms when External
Synchronization is ON depending on the frequency of the
clock signal.
 Motor evaluation: Electrical angle/rotation direction: Measure rotation speed, torque, and output
(mechanical power) of motors from analog/pulse
inputs of rotation or torque sensors.
A Variety of integration functions
Harmonic analysis: Analyze harmonics up to the 500th order for a 50/60 Hz
fundamental even at a data update interval of 50
milliseconds. The WT1800E features two options for
analyzing harmonics in addition to power parameters,
 Harmonic measurement mode (/G5 option) for
fundamental wave, harmonic components and total
harmonic distortion (THD)
 Dual Harmonic option (/G6 option) for side by side
measurement of harmonics on two different sources
for example input and output of inverters, variable speed
motors, lighting ballasts, UPS, etc.
New Functions
The advanced new functions provide greater measurement versatility by making power analysis measurements more efficient
 Dual harmonic measurement (option)*****
A harmonic measurement option (/G5) makes it possible to display both numerical data and bar graphs to help understand measurement data visually.
In addition, a dual harmonic measurement function (/G6) makes it possible to measure and display twoline harmonic bar graphs (dual harmonic) simultaneously
 Userdefined event function (Trigger)
For the first time in the highprecision power analyzer industry, an event trigger function is available to meet the requirement to capture only a particular event. For example, a trigger can be set for measured values that fall out of the power value range from 99 W to 101 W and only data that meets the trigger condition can be stored, printed, or saved to a USB memory device
Motor Version (MTR option)
— Motor evaluation: Rotating speed, Torque, and Motor output
The WT1800E’s ability to perform up to 6 power input measurements makes it possible to evaluate the battery’s charge and discharge characteristics, and test and evaluate the efficiency between the input and output of inverters. A motor evaluation function (/MTR option) makes it possible to simultaneously monitor changes in the voltage, current, and
power, as well as changes in the rotation speed and torque.
 Calculation of motor and total efficiency
In addition to the functions of the standard version, the new models offer powerful motor/inverter evaluation functions
 Voltage, current, and power measurement with torque and speed input
Measures torque meter and speed sensor output (analog or pulse output), and allows calculation of torque, revolution speed, mechanical power, speed, motor efficiency, and total efficiency in a single unit
 Aphase, Bphase, and Zphase input terminals
The Aphase and Bphase make it possible to detect the rotation direction of motors. In addition, electrical angle can be measured using Zphase signals
 Inverter, motor, and DC/DC converter efficiency measurements
A WT1800E is capable of measuring the effective power, frequency, and motor output in order to measure the total efficiency, including inverter and motor
efficiency and battery DC/DC conversion efficiency. DC power accuracy has been improved to ±0.05% to ensure more accurate measurements
DA output and remote control (/DA)
— Sometimes you may want to check changes in data, along with other measurement data (temperature, etc) at the same time when you acquire communication data, such as voltage, current, power, and efficiency data. Integration can be linked by inputting an analog trigger signal from another device.
 20 channel output
A DA output function allows you to retrieve analog signals on up to 20 channels
 Integration by remote control remote control signals make it possible to control the start, stop, and reset of integration by external analog signals
Delta Calculation (/DT)
— It is possible to obtain the differential voltage, line voltage, phase voltage, etc. by obtaining the sums and differences of instantaneous measurement values of voltage and current in each element.
 Checking phase voltage when you measure line voltage
 Differential voltage/current:
Differential voltage and current between two elements are computed in the 3Ø – 3wire system.
 Line voltage/phase current:
Line voltage and phase current that are not measured are computed in the threephase 3Ø – 3wire system
 Stardelta conversion:
Line voltage is computed from the phase voltage using the 3Ø – 4wire system data. l
 Deltastar conversion:
Phase voltage is computed from the line voltage in the 3Ø – 3wire system (3V3A system)
Added Frequency Measurement (/FQ)
 Checking the frequencies of all inputs
In addition to the standard 3 channels of frequency measurement, a 12channel frequency measurement option is also available. This option provides frequency measurement of voltage and current on all channels (with input elements 1 through 4 installed). This is necessary when you want to measure voltage and current frequency from the instrument’s I/O as well as voltage and current frequencies of multiple items under test at the same time
 D/A Output (/DA)
 20 Channels (Output parameter can be set for each channel)
Measured values and calculated value by userdefined function can be output as ± 5V FS DC voltages from the D/A output connector on the rear panel. ± (Accuracy of each measurement function +0.1% of FS) FS=5 V
Auxiliary Sensor Inputs (/AUX)
The WT1800E allows you to measure voltage, current, and power, as well as compute the light emitting efficiency (lamp efficiency) by connecting the output of an illuminance meter, etc. to the external signal input terminal (/AUX option)
 Light emitting efficiency and power measurements of LED lights (/AUX option)
It is important for LED lights to increase the light emitting efficiency while at the same time reducing the current and power consumption.
 Pyranometer (photovoltaic power generation) (/AUX option)
 Vane anemometer (wind power generation) (/AUX option)
760122 WTViewer Software
Multichannel synchronized measurements using WTViewer
WTViewer is application software that allows you to read numerical data measured with a WT1800E Precision Power Analyzer to a PC via Ethernet, GPIB, or USB communication,
and display and save the numerical values. Up to 12 power inputs can be measured simultaneously in synchronized measurements between two units. Also, the
ability to collect data of up to four WT1800 units allows you to measure the conversion efficiency, power, and power loss of up to 24 power inputs.
 Up to 20 inverter/converter efficiency computations can be set.
WTViewer is application software that allows you to read numerical data measured with a WT1800 Precision Power Analyzer to a PC via Ethernet, GPIB, or USB communication, and display and save the numerical values.
 12power measurements:
up to 12 power inputs can be measured simultaneously in synchronized measurements between two units. Also, the ability to collect data of up to four WT1800 units allows you to measure the conversion efficiency, power, and power loss of up to 24 power inputs
Computation Example:
Inverter discharge efficiency ID1P Σ A/ID1P1×100[%], Converter charge efficiency ID2P1/D2P Σ A×100[%]
Inverter charge efficiency ID1P1/ID1P Σ A×100[%], Motor efficiency ID1Pm/ID1P Σ A×100[%]
Free Download links from Yokogawa
Download free software from Yokogawa
Download Energy Star free software from Yokogawa
STANDARD ACCESSORIES 
OPTIONAL ACCESSORIES (Brochure Download) 
Cables 

366924 — BNC cable BNC–BNC, 1 m — Qty 1
BNC cable BNC–BNC, 1 meter 

366925 —BNC cable BNC–BNC, 2 m — Qty 1
BNC cable BNC–BNC, 2 meters 
Adapter Sets 

758917 —Measurement lead — Qty 1
75 cm, two leads (red and black) in a set 

758921 —(Fork terminal adapter set) — Qty 1 4 mm fork terminal, banana terminal conversion, red and black (one each) 

758922 — Alligator clip adapter (rated for 300 V) — Qty 1
Banana–alligator conversion, two in a set 

758923 — Safety terminal adapter — Qty 1
(springhold type) Two adapters to a set. 

758924— Conversion adapter — Qty 1
BNCbananajack(female) adapter 

758931 — Safety terminal adapter — Qty 1
(screwfastened type) Two adapters to a set. 1.5 mm hex Wrench is attached 

701959 — Safety miniclip — Qty 1
Hook type. Two in a set 
Current Sensors / Current transducer 

CT1000— AC/DC Current sensor (ratio: 1500: 1 , DC to 300 kHz)— Qty 1
±(0.05% of rdg + 30 μA) : 1000 Apk


CT200 —AC/DC Current sensor (ratio: 1000: 1, DC to 500 kHz) — Qty 1
±(0.05% of rdg + 30 μA), 200 Apk 

CT60— Current sensor (ratio: 600: 1, DC to 800 kHz) — Qty 1
±(0.05% of rdg + 30 μA), 60 Apk 
Software 

760122 —WTViewer— For WT1800 Software 
Miscellaneous 

B9316FX — Printer roll pager — Qty 1 Thermal paper, 10 meters (1 roll) 

B9284LK —External sensor cable — Qty 1
Current sensor input connector. Length 0.5m 

701960 — Compact Instrument Cart — Qty 1 Compact Cart 

701961 — Deluxe Instrument Cart — Qty 1 Deluxe Cart 

701962 — Generalpurpose Instrument Cart — Qty 1 Generalpurpose Cart 

751535EA — Rack Mount Kit — Qty 1 For EIA 
